A touch display apparatus and an operation method of a touch apparatus thereof are provided. The operation method of the touch apparatus includes the following steps, namely, providing a touch capability regulating signal according to a plurality of image data in a column of an image frame; providing a touch driving signal to a first touch electrode in sequence according to a first clock signal and a second clock signal; changing at least one of an amplitude and a frequency of the first clock signal and the second clock signal according to the touch capability regulating signal.
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1. A touch display apparatus, comprising: a display apparatus, comprising: a pixel array forming a display area; and a display driving circuit receiving an image signal and coupled to the pixel array to drive the pixel array according to the image signal, and providing a touch capability regulating signal according to a plurality of image data in a column of an image frame, wherein the display driving circuit counts a voltage edge in a plurality of pixel voltages corresponding to the image data in the column of the image frame and compares a counting result of the voltage edge with an interference threshold to provide the touch capability regulating signal; and a touch apparatus, comprising: a plurality of first touch electrodes and a plurality of second touch electrodes configured to interlace with one another to form a touch area, wherein the touch area overlaps the display area; a touch driving circuit coupled to the first touch electrodes to provide a touch driving signal to the first touch electrodes in sequence according to a first clock signal and a second clock signal; and a touch detecting circuit coupled to the second touch electrodes to receive a touch detecting signal, coupled to the touch driving circuit to provide the first clock signal and the second clock signal, and coupled to the display driving circuit to change at least one of an amplitude and a frequency of the first clock signal and the second clock signal according to the touch capability regulating signal.
A touch display apparatus integrates a display and touch sensing system to reduce interference between the two functions. The display apparatus includes a pixel array forming a display area and a display driving circuit that processes image signals to drive the pixel array. The display driving circuit also generates a touch capability regulating signal by analyzing voltage edges in pixel voltages within a column of an image frame. It counts these edges and compares the result to an interference threshold, adjusting the touch capability regulating signal accordingly. The touch apparatus features interlaced first and second touch electrodes forming a touch area that overlaps the display area. A touch driving circuit sequentially provides a touch driving signal to the first touch electrodes using a first and second clock signal. A touch detecting circuit receives touch detecting signals from the second touch electrodes and adjusts the amplitude or frequency of the clock signals based on the touch capability regulating signal from the display driving circuit. This dynamic adjustment minimizes interference between display operations and touch sensing, improving touch accuracy and responsiveness. The system ensures reliable touch detection even when displaying complex images with frequent voltage transitions.
2. The touch display apparatus according to claim 1 , wherein, when an occurrence of the voltage edge in the plurality of pixel voltages corresponding to the image data in the column is greater than or equal to the interference threshold, the touch detecting circuit increases at least one of the amplitude and the frequency of the first clock signal and the second clock signal, when the occurrence of the voltage edge in the pixel voltages is less than the interference threshold, the touch detecting circuit recovers the amplitude and the frequency of the first clock signal and the second clock signal.
In the touch display device described previously, the touch detecting circuit modifies the clock signals used to drive the touch sensors based on image content. If the number of voltage changes between adjacent pixels in a column exceeds a certain threshold, the circuit increases either the amplitude, the frequency, or both, of the clock signals. Conversely, if the number of voltage changes is below the threshold, the circuit restores the clock signals to their original amplitude and frequency. This dynamic adjustment compensates for display interference that might affect touch sensing accuracy.
3. The touch display apparatus according to claim 2 , wherein the voltage edge is a voltage difference which is between each of the pixel voltages and the adjacent pixel voltage and greater than or equal to a voltage oscillation threshold.
In the touch display device where clock signals are adjusted based on image content, a "voltage edge" is defined as the voltage difference between two adjacent pixels exceeding a "voltage oscillation threshold." In other words, only significant voltage changes between pixels are counted when determining whether to adjust the touch sensor clock signals, filtering out minor fluctuations. This improves the accuracy of the interference detection.
4. The touch display apparatus according to claim 1 , wherein the first touch electrodes and the second touch electrodes perpendicularly interlace with one another.
In the touch display device combining a display and touch sensor, the first and second touch electrodes are arranged perpendicularly to each other. This orthogonal arrangement facilitates precise touch localization by creating a grid-like sensing pattern, where each intersection point defines a unique coordinate.
5. The touch display apparatus according to claim 1 , wherein the touch driving circuit provides the touch driving signal to the first touch electrode in sequence during a touch detecting period, and the touch detecting period overlaps a frame scanning period of the pixel array.
In the touch display device with integrated touch sensing, the touch driving circuit sends signals to the first touch electrodes sequentially during a "touch detecting period". This "touch detecting period" occurs simultaneously with the normal frame scanning of the display pixels. This allows touch events to be detected while the display is refreshing, providing continuous touch responsiveness.
6. The touch display apparatus according to claim 1 , wherein the first clock signal and the second clock signal are inversion signals of each other.
In the touch display device that uses two clock signals to drive touch sensing, the first clock signal and the second clock signal are inversions of each other. This means that when one clock signal is high, the other is low, and vice versa. Using inverse clock signals can improve touch signal quality and reduce noise.
7. The touch display apparatus according to claim 1 , wherein the display apparatus further comprises: an active array substrate; and a color filter substrate assembled together with the active array substrate; wherein the pixel array, the display driving circuit and the touch driving circuit are configured at the active array substrate, the first touch electrodes and the second touch electrodes are configured at the color filter substrate.
The touch display device consists of an active array substrate and a color filter substrate assembled together. The pixel array, display driving circuit, and touch driving circuit are all located on the active array substrate. The first and second touch electrodes are located on the color filter substrate. This physical separation of touch electrodes from the display driving components optimizes manufacturing and reduces potential electrical interference.
8. The touch display apparatus according to claim 7 , wherein the display driving circuit comprises: a gate driver coupled to the pixel array to drive a plurality of pixels in the pixel array row by row; a source driver coupled to the pixel array to provide a plurality of pixel voltages to the pixels in sequence according to the image data; and a timing controller coupled to the gate driver, the source driver and the touch detecting circuit, receiving the image signal to provide the image data, wherein the timing controller controls the gate driver according to the image signal, the timing controller provides the image data to the source driver according to the image signal, and provides the touch capability regulating signal according to the image data.
In the touch display device, the display driving circuit includes a gate driver, a source driver, and a timing controller. The gate driver activates rows of pixels. The source driver provides pixel voltages according to image data. The timing controller receives the image signal and controls the gate and source drivers. Crucially, the timing controller also calculates the "touch capability regulating signal" from the image data and sends this to the touch detecting circuit. The timing controller provides the image data to the source driver and controls the gate driver based on the image signal.
9. The touch display apparatus according to claim 8 , wherein the gate driver and the touch driving circuit respectively comprise a plurality of shifter registers.
In the described touch display, both the gate driver (which controls the display pixels) and the touch driving circuit (which controls the touch sensors) utilize shift registers. Shift registers are used to sequentially activate rows of pixels or touch electrodes, enabling efficient scanning and signal transmission.
10. An operation method of a touch apparatus, comprising: providing a touch capability regulating signal according to a plurality of age data in a column of an image frame; providing a touch driving signal to a plurality of first touch electrodes in sequence according to a first clock signal and a second clock signal; and changing at least one of an amplitude and a frequency of the first clock signal and the second clock signal according to the touch capability regulating signal, wherein the step of providing the touch capability regulating signal according to the plurality of image data in the column of the image frame comprises: counting a voltage edge in a plurality of pixel voltages corresponding to the image data in the column of the image frame; and comparing a counting result of the voltage edge with an interference threshold to provide the touch capability regulating signal.
A method for operating a touch apparatus involves generating a "touch capability regulating signal" based on image data in each column of a display frame. A touch driving signal is then sent to first touch electrodes using two clock signals. The amplitude or frequency of those clock signals is then adjusted based on the "touch capability regulating signal". The process of generating the "touch capability regulating signal" involves counting voltage edges in pixel voltages and comparing that count to an interference threshold.
11. The operation method of the touch apparatus according to claim 10 , wherein the step of changing at least one of the amplitude and the frequency of the first clock signal and the second clock signal according to the touch capability regulating signal comprises: when an occurrence of the voltage edge in the plurality of pixel voltages corresponding to the image data of the column is greater than or equal to the interference threshold, increasing at least one of the amplitude and the frequency of the first clock signal and the second clock signal; and when the occurrence of the voltage edge in the plurality of pixel voltages is less than the interference threshold, recovering the amplitude and the frequency of the first clock signal and the second clock signal.
The touch apparatus operation method adjusts clock signals based on image content. If the number of voltage edges in the pixel voltages of a column is greater than or equal to an interference threshold, the amplitude or frequency of the clock signals is increased. Conversely, if the number of voltage edges is less than the threshold, the amplitude and frequency of the clock signals are restored to their original values.
12. The operation method of the touch apparatus according to claim 11 , wherein the voltage edge is a voltage difference which is between each of the pixel voltages and the adjacent pixel voltage and greater than or equal to a voltage oscillation threshold.
In the touch apparatus operation method that adjusts clock signals, a "voltage edge" is defined as a voltage difference between adjacent pixels that is greater than or equal to a "voltage oscillation threshold." This threshold filters out minor voltage fluctuations, ensuring that only significant changes in pixel voltage affect the adjustment of clock signals.
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January 19, 2015
April 11, 2017
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